Full Idea
Some of what metaphysicians take to be metaphysically possible turns out to be only epistemically possible.
Clarification
'epistemically' means 'for all we know'
Gist of Idea
The apparently metaphysically possible may only be epistemically possible
Source
Barbara Vetter (Essence and Potentiality [2010], §4)
A Reaction
A nice clear expression of the increasingly common view that conceivability may be a limited way to grasp possibility.